Biden gets in testy exchange in Iowa: 'You're a damn liar'

Former Vice President Joe BidenJoe BidenTrump shakes up WH communications team The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic The Intercept's Ryan Grim says Cuomo is winning over critics MORE on Thursday got in a tense back-and-forth with an audience member during an Iowa campaign stop after the man made debunked claims that the former vice president sent his son Hunter Biden to work for an energy company in Ukraine.

"You're a damn liar, man. That's not true," Biden shot back at the man, who said the claims, which have been circulated by some on the right, were backed up by reporting on television.

After some cross-talk, Biden told the man, "By the way ... I'm not sedentary," before going on to challenge him to a push-up contest and other physical tests.

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"You want to check my shape man, let's do pushups together here, man," Biden told him. "Let's run. Let's do whatever you want to do. Let's take an IQ test. OK?"

When the man replied that he wouldn't be voting for Biden in the primary, the former Delaware senator replied: "Of course you're not; you're too old to vote for me!" 

Biden campaign senior adviser Symone SandersSymone SandersBiden and the left: Too many excuses for China The Hill's Morning Report — Presented by the APTA — Now it's Biden vs. Bernie: no endorsement from Warren 'Easy access' to Biden allowed protester to rush stage at rally MORE later took to Twitter to defend the former vice president, saying the attendee's "facts were flat-out wrong" and "the crowd backed VP Biden up in his response."

Biden, who would become the oldest person ever elected president should he win his party's nomination and defeat President TrumpDonald John TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill MORE, has repeatedly brushed off any questions about his health and physical fitness on the campaign trail.

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Should he win the general election in 2020, Biden would be 78 by Inauguration Day. Trump previously set the record for age at a presidential inauguration – he was 70 years old when he was sworn into office in 2017.

The tense exchange at the event Thursday comes as Biden has pushed back against claims promoted by Trump and his allies that the former vice president acted inappropriately by pressing Ukraine to fire a top prosecutor in 2015 while his son served on the board of Burisma, a Kyiv-based oil holdings company that had been investigated by Ukrainian officials.

Both Bidens have denied any wrongdoing, and claims that the vice president acted with his son’s interests in mind have been found to be baseless, though GOP lawmakers have pushed to investigate the efforts amid the House impeachment inquiry targeting Trump's own interactions with Ukraine.

In his now-infamous July 25 phone call with Ukrainian President Volodymyr Zelensky, Trump asked Zelensky to investigate the Bidens and the 2016 presidential election, telling the foreign leader to work with his personal lawyer Rudy GiulianiRudy GiulianiThe Hill's Morning Report - Presented by Facebook - Trump: Tough times but progress being made Giuliani touts experimental coronavirus treatment in private conversations with Trump Trump team picks fight with Twitter, TV networks over political speech MORE and Attorney General William BarrWilliam Pelham BarrAppeals court sides with Trump on federal execution policy Barr tells prosecutors to consider coronavirus risk when determining bail: report Decentralized leadership raises questions about Trump coronavirus response MORE.

The call is at the heart of the impeachment inquiry in the House, with Democrats arguing that Trump abused his power by asking a foreign government to interfere in U.S. elections and investigate a key political rival. Trump has maintained that the call was "perfect."

—Updated at 5:39 p.m.